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DE19741199A1 - Static mixer - Google Patents

Static mixer

Info

Publication number
DE19741199A1
DE19741199A1 DE19741199A DE19741199A DE19741199A1 DE 19741199 A1 DE19741199 A1 DE 19741199A1 DE 19741199 A DE19741199 A DE 19741199A DE 19741199 A DE19741199 A DE 19741199A DE 19741199 A1 DE19741199 A1 DE 19741199A1
Authority
DE
Germany
Prior art keywords
exhaust gas
static mixer
expanded metal
mixer according
expanded
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
DE19741199A
Other languages
German (de)
Other versions
DE19741199C2 (en
Inventor
Lothar Dipl Ing Hofmann
Wieland Dipl Ing Mathes
Udo Klumpp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE19741199A priority Critical patent/DE19741199C2/en
Application filed by Siemens AG filed Critical Siemens AG
Priority to DE59804914T priority patent/DE59804914D1/en
Priority to ES98954196T priority patent/ES2181290T3/en
Priority to KR10-2000-7002858A priority patent/KR100366679B1/en
Priority to PCT/DE1998/002780 priority patent/WO1999013972A1/en
Priority to JP2000511577A priority patent/JP2001516635A/en
Priority to DK98954196T priority patent/DK1007191T3/en
Priority to EP98954196A priority patent/EP1007191B1/en
Priority to AT98954196T priority patent/ATE220945T1/en
Publication of DE19741199A1 publication Critical patent/DE19741199A1/en
Priority to US09/519,384 priority patent/US6401449B1/en
Application granted granted Critical
Publication of DE19741199C2 publication Critical patent/DE19741199C2/en
Priority to US10/133,258 priority patent/US6553755B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/21—Mixing gases with liquids by introducing liquids into gaseous media
    • B01F23/213—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
    • B01F25/3131—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/45—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
    • B01F25/452—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces
    • B01F25/4523—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces the components being pressed through sieves, screens or meshes which obstruct the whole diameter of the tube
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Toxicology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Dispersion Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)
  • Wrappers (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

Disclosed is an expanded metal fabric (4) comprising a number of meshes formed between crossbars (22), and used as a static mixer in the discharge channel of an emission control device in an excess air-operated combustion engine. The use of the expanded metal fabric (4) permits not only the exhaust gas (A) to be correctly mixed on a short path by means of a reducer (R), but also the gas (A) to flow in the appropriate direction in the channel (2).

Description

Die Erfindung bezieht sich auf einen statischen Mischer im Strömungskanal einer Abgasreinigungsanlage eines mit Luft­ überschuß betriebenen Verbrennungsmotors.The invention relates to a static mixer in Flow channel of an exhaust gas purification system with air excess operated internal combustion engine.

Zur Vermeidung der im Abgas eines Verbrennungsmotors enthal­ tenen Schadstoffe, im besonderen der Stickoxide, hat sich das Prinzip des geregelten oder gesteuerten Dieselkatalysators (GDK) als vorteilhafte Technik erwiesen. Diese Technik wird vor allem bei Verbrennungsmotoren, die mit Luftüberschuß be­ trieben werden, wie z. B. bei Diesel- und Magermotoren, einge­ setzt. Bei dieser im wesentlichen auf dem Verfahren der se­ lektiven katalytischen Reduktion (SCR) beruhenden Technik werden die Stickoxide zusammen mit einem Reduktionsmittel an einem selektiven Katalysator kontaktiert und dort zu unbe­ denklichem Stickstoff und zu Wasser umgesetzt.To avoid contained in the exhaust gas of an internal combustion engine The most pollutants, especially nitrogen oxides, has become Principle of the regulated or controlled diesel catalytic converter (GDK) proved to be an advantageous technique. This technique will especially in internal combustion engines that be with excess air are driven, such. B. in diesel and lean engines puts. In this essentially on the process of se selective catalytic reduction (SCR) based technique the nitrogen oxides together with a reducing agent contacted a selective catalyst and there too unbe conceivable nitrogen and implemented in water.

Eine nach diesem Prinzip arbeitende Abgasreinigungsanlage wird unter der Bezeichnung SiNOx-Abgasreinigungssystem von der Firma Siemens AG, Berlin und München, Deutschland, ver­ trieben (Firmenbroschüre "SINOx Stickoxidminderung für sta­ tionäre Dieselmotoren", Bestell-Nr. A96001-U91-A232). Mit ei­ ner solchen Anlage kann die Stickoxid-Emission eines Diesel­ motors drastisch reduziert werden. Dabei werden die Stick­ oxide des Abgases mit dem Reduktionsmittel, üblicherweise aus Harnstoff durch Hydrolyse gewonnener Ammoniak, im Abgasrohr vermischt und zur katalytischen Umsetzung in einen Reaktions­ raum mit einer Katalysator-Einrichtung geleitet. Zur Vermi­ schung des Reduktionsmittels mit dem Abgas wird üblicherweise ein statischer Mischer eingesetzt, wie dieser z. B. aus der DE 43 13 393 A1 bekannt ist.An exhaust gas purification system based on this principle is marketed under the name SiNOx emission control system by from Siemens AG, Berlin and Munich, Germany, ver drives (company brochure "SINOx nitrogen oxide reduction for sta stationary diesel engines ", order no. A96001-U91-A232). With egg ner such plant can the nitrogen oxide emission of a diesel motors can be drastically reduced. The stick oxides of the exhaust gas with the reducing agent, usually from Ammonia obtained by hydrolysis, in the exhaust pipe mixed and for catalytic conversion into a reaction room with a catalytic converter. To the Vermi The reducing agent is usually mixed with the exhaust gas a static mixer used, such as this z. B. from the DE 43 13 393 A1 is known.

Zwar liefert der bekannte statische Mischer bezüglich einer homogenen Mischung des Reduktionsmittels mit dem Abgas bei einer derartigen reduktionsmittelbetriebenen Abgasreinigungs­ anlage bereits ein zufriedenstellendes Ergebnis. Da bei Fahr­ zeugen üblicherweise die Abgasrohrführung und damit die Füh­ rung des Strömungskanals entsprechend der Fahrzeugkonstruk­ tion angepaßt werden muß, kann in vielen Anwendungsfällen aufgrund des fehlenden Einbauraumes die von diesem Mischer benötigte Mindestmischstrecke häufig nicht realisiert werden. In einem solchen Fall ergeben sich dann ungünstige Einström­ verhältnisse in den den Katalysator enthaltenden Reaktions­ raum mit der Folge eines ungleichmäßigen Strömungsprofils am Katalysatoreintritt.The known static mixer supplies one homogeneous mixture of the reducing agent with the exhaust gas  such a reducing agent operated exhaust gas cleaning already a satisfactory result. Since driving usually testify the exhaust pipe routing and thus the Füh tion of the flow channel according to the vehicle construction tion must be adapted, in many applications due to the lack of installation space that of this mixer required minimum mixing distance can often not be realized. In such a case, there are unfavorable inflows conditions in the reaction containing the catalyst space with the consequence of an uneven flow profile on Catalyst entry.

Der Erfindung liegt daher die Aufgabe zugrunde, einen stati­ schen Mischer im Strömungskanal einer derartigen Abgasreini­ gungsanlage anzugeben, der bei gleichzeitig möglichst kurzer Mischstrecke auch eine Strömungsrichtung, d. h. eine Ausrich­ tung der Strömung des Abgases im Strömungskanal, ermöglicht.The invention is therefore based on the object, a stati 's mixer in the flow channel of such an exhaust gas cleaning supply system, which is at the same time as short as possible Mixing section also a flow direction, d. H. an alignment device of the flow of the exhaust gas in the flow channel.

Diese Aufgabe wird erfindungsgemäß gelöst durch die Merkmale des Anspruchs 1. Dabei wird als statischer Mischer ein Streckgitter mit einer Anzahl von zwischen Stegen gebildeten Maschen in den Strömungskanal eingesetzt.This object is achieved according to the invention by the features of claim 1. Here is used as a static mixer Expanded mesh with a number of formed between webs Mesh used in the flow channel.

Das Streckgitter kann aus Kunststoff oder aus Metall beste­ hen, wobei letzteres auch als Streckmetall bezeichnet wird. Ein derartiges Streckgitter ist z. B. in dem Firmenprospekt "Strecken macht größer, Streckgitter" der Firma Ernst Sorst + Co., Hannover (DE) beschrieben und in vielfältiger Ausführung im Handel erhältlich. Aus der DE-C 32 08 634 ist es bekannt, ein Streckmetallblech als Träger für eine kata­ lytische Substanz bei der Herstellung von Katalysatorplatten einzusetzen.The expanded metal can be made of plastic or metal hen, the latter is also called expanded metal. Such expanded metal is such. B. in the company brochure "Stretching makes bigger, expanded metal" from Ernst Sorst + Co., Hanover (DE) described and in diverse Execution commercially available. From DE-C 32 08 634 it is known to use expanded metal sheet as a support for a kata lytic substance in the manufacture of catalyst plates to use.

Das Streckgitter weist zusätzlich zur Funktion eines Mischers auch die Funktion eines Strömungsrichters auf. Beim Betrieb der Abgas- und Abgasreinigungsanlage wird aufgrund der durch das Streckgitter erzeugten Mischbewegung ein in die Abgasrei­ nigungsanlage eingebrachtes Reduktionsmittel mit dem Abgas vermischt. Gleichzeitig beeinflußt das Streckgitter die Strö­ mung hinsichtlich einer gezielten Ausrichtung stets zumindest annähernd parallel zur Längsachse oder Symmetrieachse des Strömungskanals. Unterstützt durch eine geeignete Anordnung des Streckgitters werden insbesondere infolge vorgegebener Einbauverhältnisse hervorgerufene ungünstige Strömungsprofile innerhalb des Strömungskanals in besonders einfacher und ef­ fektiver Weise aufgehoben und die Strömung vergleichmäßigt.The expanded metal also functions as a mixer also the function of a flow judge. During operation The exhaust and exhaust gas cleaning system is due to the the expanded metal generated mixing motion into the exhaust gas  reduction system introduced with the exhaust gas mixed. At the same time, the expanded metal influences the flow at least with regard to a targeted alignment approximately parallel to the longitudinal axis or axis of symmetry of the Flow channel. Supported by a suitable arrangement of the expanded metal are, in particular, as a result of predetermined ones Installation conditions caused unfavorable flow profiles within the flow channel in a particularly simple and ef fectively canceled and the flow smoothed.

Das Streckgitter füllt zweckmäßigerweise den gesamten Rohr­ querschnitt des Strömungskanals aus und weist einen freien Querschnitt von 25% bis 85% auf. Das Streckgitter kann je nach Anwendungsfall fein- oder grobmaschig sowie als Lang­ stegstreckgitter ausgebildet sein. Dabei erfolgt der Einbau des Streckgitters zweckmäßigerweise senkrecht zur Längs- oder Rohrachse des Strömungskanals oder unter einem Neigungswinkel gegenüber dem senkrechten Einbau von bis zu 45%.The expanded metal expediently fills the entire tube cross section of the flow channel and has a free Cross section from 25% to 85%. The expanded metal can ever depending on the application, fine or coarse-meshed as well as long web expanded metal mesh be formed. The installation takes place of the expanded metal expediently perpendicular to the longitudinal or Pipe axis of the flow channel or at an angle of inclination compared to vertical installation of up to 45%.

Bei einer Umströmung der Gitterknoten oder Knotenpunkte des Streckgitters werden Wirbel und Turbulenzen erzeugt, die die Mischung hervorrufen. Gleichzeitig richten die Stege des Streckgitters die Strömung des Abgases oder des bereits mit Reduktionsmittel beaufschlagten Abgases entsprechend deren Anstellwinkel aus. Mit zunehmendem Verhältnis zwischen der Stegbreite und der Stegdicke wird ein zunehmender Effekt der Strömungseinrichtung ausgebildet. Mit abnehmendem Verhältnis ergibt sich demgegenüber ein verstärkter Mischeffekt. Ein be­ sonders bevorzugter Bereich des Verhältnisses zwischen Steg­ breite und Stegdicke wurde zwischen 0,5 und 5 gefunden.When the lattice nodes or nodes of the Expanded mesh creates vortexes and turbulence that the Cause mixture. At the same time, the webs of the Expanded mesh the flow of the exhaust gas or the already Reducing agent acted upon exhaust gas according to their Angle of attack off. With increasing ratio between the Web width and web thickness is an increasing effect of Flow device trained. With a decreasing ratio in contrast, there is an increased mixing effect. A be particularly preferred range of the relationship between web width and web thickness were found between 0.5 and 5.

Das Streckgitter kann mit weiteren Streckgittern nach Art ei­ nes Lagenpaketes zusammengefaßt sein. Auch können mehrere einzelne Streckgitter oder Streckgitter-Lagenpakete bezogen auf die Strömungsrichtung des Abgases hintereinander angeord­ net sein. Dabei ist der Abstand zwischen benachbarten Lagen vorzugsweise kleiner oder gleich dem 5-fachen des Durchmes­ sers des Strömungskanals.The expanded metal can with other expanded metal in the manner of egg Layer package be summarized. Even several can individual expanded metal or expanded metal layer packages covered arranged one behind the other on the flow direction of the exhaust gas be nice. The distance between adjacent layers  preferably less than or equal to 5 times the diameter flow channel.

Bei einer Eindüsung von üblicherweise wäßrigem Reduktionsmit­ tel in den Einströmkanal ist vorteilhafterweise bezogen auf die Strömungsrichtung des Abgases vor der Eindüsstelle minde­ stens eines der Streckgitter angeordnet. Dies ist besonders vorteilhaft, wenn die Eindüsung innerhalb eines Rohrbogens des Einströmkanals erfolgt, da im äußeren Bereich des Rohrbo­ gens mehr Abgas strömt als im inneren Bereich. Die dadurch bedingten ungünstigen Strömungsverhältnisse im Rohrbogen füh­ ren normalerweise zu einer besonders ungleichmäßigen Beauf­ schlagung des Abgases mit dem strahlkegelförmig in den Ein­ strömkanal eingebrachten Reduktionsmittel. Dieses ungünstige Strömungsprofil wird mittels des vorgeordneten Streckgitters vergleichmäßigt, so daß auch im Krümmungsbereich eine homoge­ ne Vermischung des Abgases mit dem Reduktionsmittel erfolgt. Zur weiteren Vergleichmäßigung des Strömungsprofils bei Ein­ tritt des Abgas-Reduktionsmittel-Gemisches in den Reaktions­ raum und damit unmittelbar vor dem Katalysator ist dort zweckmäßigerweise ein weiteres Streckgitter vorgesehen.With injection of usually aqueous reducing agent tel in the inflow channel is advantageously based on the direction of flow of the exhaust gas before the injection point arranged at least one of the expanded metal. This is special advantageous if the injection within a pipe bend of the inflow channel takes place because in the outer area of the Rohrbo more exhaust gas flows than in the inner area. The result unfavorable flow conditions in the elbow lead usually to a particularly uneven Beauf striking the exhaust gas with the jet cone-shaped in the one flow channel introduced reducing agent. This awkward The flow profile is created using the upstream expanded metal equalized, so that even in the area of curvature a homogeneous ne mixing of the exhaust gas with the reducing agent. To further even out the flow profile at on occurs the exhaust gas-reducing agent mixture in the reaction space and thus immediately in front of the catalyst is there expediently provided a further expanded metal.

Bei Verwendung einer Anzahl von Streckgittern in mehreren La­ gen oder Lagenpaketen erfolgt die Ausrichtung der Streckgit­ ter zueinander zunächst im Hinblick auf eine besonders gute Mischung des Abgases mit dem Reduktionsmittel. Dabei dient die stromabwärts letzte Lage außerdem zur Strömungsrichtung entsprechend der nachfolgenden Rohr- oder Kanalführung. Bei mehreren Lagen werden vorzugsweise unterschiedliche Streck­ gitter mit verschiedenen Maschenöffnungen, Stegabmessungen und/oder Knotenabmessungen eingesetzt.When using a number of expanded metal in several La The orientation of the expanded metal is carried out in layers or layer packages ter each other initially with a view to a particularly good one Mixing the exhaust gas with the reducing agent. It serves the last position downstream also to the direction of flow according to the following pipe or duct routing. At several layers are preferably different stretch grids with different mesh openings, web dimensions and / or node dimensions used.

Die mit der Erfindung erzielten Vorteile bestehen insbeson­ dere darin, daß durch Verwendung eines Streckgitters als sta­ tischer Mischer im Strömungskanal einer Abgasreinigungsanlage eines mit Luftüberschuß betriebenen Verbrennungsmotors einer­ seits bereits auf einer besonders kurzen Mischstrecke eine gute Durchmischung des Abgases mit einem Reduktionsmittel er­ reicht wird. Andererseits wird in besonders einfacher Weise auch eine Vergleichmäßigung der Strömung des Abgases und/oder eines Abgas-Reduktionsmittel-Gemisches aufgrund der zusätzli­ chen Funktion einer Strömungsrichtung des Streckgitters er­ zielt.The advantages achieved with the invention are in particular the fact that by using a expanded metal as sta mixer in the flow channel of an exhaust gas cleaning system of an internal combustion engine operated with excess air on the one hand on a particularly short mixing section  thorough mixing of the exhaust gas with a reducing agent is enough. On the other hand, in a particularly simple manner also an equalization of the flow of the exhaust gas and / or an exhaust gas reducing agent mixture due to the additional Chen function of a flow direction of the expanded metal he aims.

Ausführungsbeispiele der Erfindung werden anhand einer Zeich­ nung näher erläutert. Darin zeigen:Embodiments of the invention are based on a drawing tion explained in more detail. In it show:

Fig. 1 schematisch eine Abgasreinigungsanlage mit Anord­ nung jeweils eines statischen Mischers vor und nach einer Eindüs-Einrichtung und mit einem SCR-Kataly­ sator, Fig. 1 schematically shows an exhaust gas purification system with Anord voltage respectively of a static mixer before and after a Eindüs device and with an SCR Kataly sator,

Fig. 2 im Ausschnitt einen Strömungskanal der Abgasreini­ gungsanlage gemäß Fig. 1 mit einem darin geneigt an­ geordneten statischen Mischer, Fig. 2 in cutting a flow channel of exhaust gas washer system of FIG. 1 with an inclined therein to parent static mixer,

Fig. 3 der statische Mischer in Form eines Streckgitters, und Fig. 3, the static mixer in the form of an expanded metal, and

Fig. 4 das Streckgitter in einer Seitenansicht entlang der Linie IV-IV gemäß Fig. 3. Fig. 4, the expanded metal in a side view along the line IV-IV of FIG. 3.

Einander entsprechende Teile sind in allen Figuren mit den gleichen Bezugszeichen versehen.Corresponding parts are in all figures with the provided with the same reference numerals.

Nach Fig. 1 wird von einem (nicht dargestellten) mit Luftüber­ schuß betriebenen Verbrennungsmotor, z. B. einem Dieselmotor, ein Abgas A abgegeben, daß (z. B. über einen nicht gezeigten Abgasturbolader) in einen Strömungskanal in Form eines Abgas­ rohres 2 geleitet wird. Im Abgasrohr 2 befindet sich ein sta­ tischer Mischer in Form eines in Fig. 3 dargestellten Streck­ gitters 4. In Strömungsrichtung nachfolgend ist eine Ein­ düs-Einrichtung 6 für ein Reduktionsmittel R in einem Krüm­ mungsbereich des Abgasrohres 2, d. h. in einem Rohrbogen 8 angeordnet. Bei diesem Reduktionsmittel R kann es sich um Am­ moniak (NH3), insbesondere aber um eine wäßrige Lösung von Harnstoff handeln. An einer Übergangsstelle 10 erweitert sich das Abgasrohr 2 zur Aufnahme eines Abgaskatalysators 12. Die­ ser kann z. B. gemäß der WO 97/01387 angeordnet und ausge­ führt sein. Stromaufwärts dieser Übergangsstelle 10 - und da­ mit vor dem Gehäuse des Abgaskatalysators 12 - ist im Ausfüh­ rungsbeispiel ein weiterer statischer Mischer in Form eben­ falls eines Streckgitters 4 im Abgasrohr 2 angeordnet.According to Fig. 1 (not shown) is operated with excess air combustion engine, z of one. B. a diesel engine, an exhaust gas A that (z. B. via an exhaust gas turbocharger, not shown) is passed into a flow channel in the form of an exhaust pipe 2 . In the exhaust pipe 2 there is a static mixer in the form of an expanded grille 4 shown in FIG. 3. In the flow direction, a nozzle device 6 for a reducing agent R is arranged in a curvature region of the exhaust pipe 2 , ie in a pipe bend 8 . This reducing agent R can be an ammonia (NH 3 ), but in particular an aqueous solution of urea. At a transition point 10 , the exhaust pipe 2 widens to accommodate an exhaust gas catalytic converter 12 . This water can e.g. B. arranged according to WO 97/01387 and leads out. Upstream of this transition point 10 - and since with in front of the housing of the exhaust gas catalytic converter 12 - in the exemplary embodiment, a further static mixer in the form of an expanded screen 4 is arranged in the exhaust pipe 2 .

Der vorliegend drei hintereinander angeordnete SCR-Katalysa­ tor-Module 14 aufweisende Abgaskatalysator 12 dient der Be­ seitigung von Stickoxiden (NOx) im Abgas A. Das auf diese Weise gereinigte Abgas A' verläßt das Abgasrohr 2 über eine Austrittsöffnung 16.The present three consecutively arranged SCR catalyst modules 14 having exhaust gas catalytic converter 12 serves to remove nitrogen oxides (NO x ) in the exhaust gas A. The exhaust gas A 'cleaned in this way leaves the exhaust pipe 2 via an outlet opening 16 .

Anstelle des oder jedes einzelnen Streckgitters 4 können je­ weils auch Lagenpakete 18 (Fig. 2) aus mehreren hintereinander gereihten Streckgittern 4 in das Abgasrohr 2 eingesetzt sein. Der Abstand x zwischen den einzelnen Streckgittern 4 bzw. zwischen den Lagenpaketen 18 ist zweckmäßigerweise kleiner als das 5-fache des Durchmessers D des Abgasrohres 2.Instead of the or each individual expanded metal mesh 4 , layers of layers 18 ( FIG. 2) can be inserted into the exhaust pipe 2 from several expanded metal mesh panels 4 one behind the other. The distance x between the individual expanded metal 4 or between the layer packs 18 is expediently less than 5 times the diameter D of the exhaust pipe 2 .

Gegenüber dem Stand der Technik hat sich der Einsatz des Streckgitters 4 als statischer Mischer in einer derartigen Abgasreinigungsanlage als Verbesserung einerseits der Strö­ mungs- und Reduktionsmittel-Gleichverteilung und andererseits der Strömungsausrichtung innerhalb des Abgasrohres oder Strö­ mungskanals 2 herausgestellt. So konnte bei der Verwendung des SINOx-Abgasreinigungssystems für ein Nutzfahrzeug, bei dem der Rohrbogen 8 des vom Fahrzeugmotor kommenden Abgasroh­ res 2 aufgrund des verfügbaren Einbauraums im Fahrzeug unmit­ telbar vor dem Abgaskatalysator 12 eingebaut werden mußte, durch den Einbau des Streckgitters 4 als Mischer bzw. als Strömungsrichter insbesondere vor dem Rohrbogen 8 eine nen­ nenswerte Steigerung des NOx-Umsatzes festgestellt werden. Diese Steigerung gegenüber dem bekannten Mischer kann auf den Effekt der Strömungsrichtung durch das jeweilige Streckgit­ ter 4 zurückgeführt werden, da der Rohrbogen 8 bekanntermaßen zur Ausbildung eines unsymmetrischen Strömungsprofils an der durch die Position der Eindüs-Einrichtung 6 bestimmten Ein­ düsstelle 19 und am Abgaskatalysator 12 führt.Compared to the prior art, the use of expanded metal 4 as a static mixer in such an exhaust gas cleaning system has been found to improve on the one hand the flow and reducing agent uniform distribution and on the other hand the flow orientation within the exhaust pipe or flow channel 2 . So when using the SINOx exhaust gas cleaning system for a commercial vehicle, in which the pipe bend 8 of the exhaust pipe coming from the vehicle engine res 2 had to be installed directly in front of the exhaust gas catalytic converter 12 due to the available installation space in the vehicle, by installing the expanded metal 4 as a mixer or a noteworthy increase in NOx conversion can be determined as a flow straightener, especially in front of the pipe bend 8 . This increase compared to the known mixer can be attributed to the effect of the direction of flow through the respective expanded metal 4 , since the pipe bend 8 is known to form an asymmetrical flow profile at the nozzle location 19 determined by the position of the injection device 6 and on the catalytic converter 12 .

Wie Fig. 2 zeigt, kann das oder jedes Streckgitter 4 - bezogen auf die Querrichtung 20 des Abgasrohres 2 - auch unter einem Neigungswinkel α auf die Rohrlängsachse 21 zu geneigt ange­ ordnet sein. Dabei beträgt der Neigungswinkel α vorzugsweise zwischen 0° und 45° Das dargestellte Lagenpaket 21 ist im Ausführungsbeispiel aus drei Streckgitterlagen 4a bis 4c ge­ bildet.As shown in FIG. 2, the or each expanded mesh 4 - based on the transverse direction 20 of the exhaust pipe 2 - can also be inclined at an angle of inclination α to the longitudinal axis 21 of the pipe. The angle of inclination α is preferably between 0 ° and 45 °. The layer package 21 shown is formed in the exemplary embodiment from three expanded metal layers 4 a to 4 c.

Die einzelnen Streckgitter 4 und/oder die innerhalb eines La­ genpaketes 18 eingesetzten Streckgitterlagen 4a bis 4c können auch verschiedenartig sein. So können innerhalb einer Abgas­ reinigungsanlage verschiedene der im vorgenannten Firmenpro­ spekt dargestellten Streckgittertypen, wie z. B. Langsteg­ streckgitter und verformte oder plissierte Streckgitter, kom­ biniert werden.The individual expanded metal 4 and / or the expanded metal layers 4 a to 4 c used within a stack 18 can also be of different types. So can within an exhaust gas purification system various of the expanded mesh types shown in the aforementioned Firmenpro brochure, such as. B. long web expanded metal and deformed or pleated expanded metal, be combined.

Eine mögliche Ausführungsform des Streckgitters 4 ist in Fig. 3 in perspektivischer Draufsicht und in Fig. 4 in einer Seitenansicht dargestellt. Definitionsgemäß weist das Streck­ gitter 4 eine Anzahl von jeweils durch Stege 22 begrenzte Ma­ schen 24 auf, durch die beim Betrieb der Abgasreinigungsan­ lage das Abgas A hindurchströmt. Dabei wird der Effekt der Strömungsrichtung im wesentlichen durch die Stegbreite b be­ stimmt, während die durch die Dicke des verwendeten Materials festgelegte Stegdicke d sowie die Länge und Breite der durch vier aneinanderstoßende Stege 22 gebildeten Knotenpunkte 26 den Effekt der Durchmischung bestimmen. Eine besonders gute Durchmischung und effektive Strömungsrichtung ergibt sich bei einem Verhältnis der Stegbreite b zur Stegdicke d im Bereich zwischen 0,5 und 5. Dabei sollte der durch die Summe der Öff­ nungen aller Maschen 24 gebildete freie Querschnitt zwischen 25% und 85% des Streckgitters 4 und damit der Querschnitts­ fläche πD2/4 des Abgasrohres 2 betragen.A possible embodiment of the expanded metal 4 is shown in FIG. 3 in a perspective top view and in FIG. 4 in a side view. According to the definition, the expanded mesh 4 has a number of meshes 24 , each delimited by webs 22 , through which the exhaust gas A flows when the exhaust gas cleaning system is operating. The effect of the direction of flow is essentially determined by the web width b, while the web thickness d determined by the thickness of the material used and the length and width of the nodes 26 formed by four abutting webs 22 determine the effect of the mixing. A particularly good mixing and effective flow direction results with a ratio of the web width b to the web thickness d in the range between 0.5 and 5. The free cross-section formed by the sum of the openings of all the meshes 24 should be between 25% and 85% of the expanded metal 4 and therefore the cross-sectional area πD 2/4 amount of the exhaust pipe. 2

Claims (10)

1. Statischer Mischer im Strömungskanal (2) einer Abgasreini­ gungsanlage eines mit Luftüberschuß betriebenen Verbrennungs­ motors, gekennzeichnet durch die Verwendung eines Streckgitters (4) mit einer Anzahl von zwischen Stegen (22) gebildeten Maschen (24)1. Static mixer in the flow channel ( 2 ) of an exhaust gas cleaning system of an internal combustion engine operated with excess air, characterized by the use of an expanded mesh ( 4 ) with a number of meshes ( 24 ) formed between webs ( 22 ). 2. Statischer Mischer nach Anspruch 1, dadurch gekennzeichnet, daß der durch die Maschen (24) gebildete freie Querschnitt 25% bis 85% der Querschnittsfläche des Strömungskanals (2) beträgt.2. Static mixer according to claim 1, characterized in that the free cross-section formed by the meshes ( 24 ) is 25% to 85% of the cross-sectional area of the flow channel ( 2 ). 3. Statischer Mischer nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Streck­ gitter (4) gegenüber der zur Längsachse (21) des Strömungska­ nals (2) senkrechten Querrichtung (20) geneigt ist, wobei der Neigungswinkel 0° ≦ α ≦ 45° ist.3. Static mixer according to claim 1 or 2, characterized in that the expanded grating ( 4 ) is inclined relative to the longitudinal axis ( 21 ) of the flow channel ( 2 ) perpendicular to the transverse direction ( 20 ), the angle of inclination 0 ° ≦ α ≦ 45 ° is. 4. Statischer Mischer nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Verhält­ nis der Stegbreite (b) zur Stegdicke (d) zwischen 0,5 und 5 beträgt.4. Static mixer according to one of claims 1 to 3, characterized in that the ratio between the web width (b) and the web thickness (d) between 0.5 and 5 is. 5. Statischer Mischer nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß eine Anzahl von Streckgittern (4a bis 4c) nach Art eines Lagenpakets (18) zusammengesetzt sind.5. Static mixer according to one of claims 1 to 4, characterized in that a number of expanded metal ( 4 a to 4 c) are composed in the manner of a layer package ( 18 ). 6. Statischer Mischer nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß eine Anzahl von Streckgittern (4) oder Streckgitterlagen (18) - in Strö­ mungsrichtung des Abgases (A) gesehen - hintereinander ange­ ordnet sind. 6. Static mixer according to one of claims 1 to 5, characterized in that a number of expanded metal ( 4 ) or expanded metal layers ( 18 ) - seen in the flow direction of the exhaust gas (A) - are arranged one behind the other. 7. Statischer Mischer nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß der Ab­ stand (x) zwischen benachbarten Lagen (4, 18) kleiner oder gleich dem 5-fachen des Durchmessers (D) des Strömungska­ nals (2) ist.7. Static mixer according to claim 5 or 6, characterized in that from (x) between adjacent layers ( 4 , 18 ) is less than or equal to 5 times the diameter (D) of the flow channel ( 2 ). 8. Statischer Mischer nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß das Streck­ gitter (4) - in Strömungsrichtung des Abgases (A) gesehen - vor einer Eindüsstelle (19) für ein Reduktionsmittel (R) der Abgasreinigungsanlage angeordnet ist.8. Static mixer according to one of claims 1 to 7, characterized in that the expanded grating ( 4 ) - seen in the flow direction of the exhaust gas (A) - is arranged in front of an injection point ( 19 ) for a reducing agent (R) of the exhaust gas cleaning system. 9. Statischer Mischer nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß - in Strö­ mungsrichtung des Abgases (A) gesehen - ein erstes Streckgit­ ter (4) vor einer Eindüsstelle (19) für ein Reduktionsmit­ tel (R) der Abgasreinigungsanlage angeordnet ist, und daß ein zweites Streckgitter (4) hinter der Eindüsstelle (19) und vor einem Abgaskatalysator (12) angeordnet sind.9. Static mixer according to one of claims 1 to 7, characterized in that - seen in the flow direction of the exhaust gas (A) - a first expanded metal ter ( 4 ) in front of an injection point ( 19 ) for a reducing agent (R) of the exhaust gas cleaning system and that a second expanded screen ( 4 ) is arranged behind the injection point ( 19 ) and in front of an exhaust gas catalytic converter ( 12 ). 10. Statischer Mischer nach einem oder mehreren der vorherge­ henden Ansprüche, dadurch gekennzeichnet, daß bei mehreren Lagen unterschiedliche Streckgitter (4) mit voneinander ver­ schiedenen Abmessungen der Maschen (24), der Stege (22) und/oder der Knoten (26) vorgesehen sind.10. Static mixer according to one or more of the preceding claims, characterized in that in several layers different expanded metal ( 4 ) with different ver dimensions of the mesh ( 24 ), the webs ( 22 ) and / or the knots ( 26 ) are provided are.
DE19741199A 1997-09-18 1997-09-18 Static mixer Expired - Fee Related DE19741199C2 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
DE19741199A DE19741199C2 (en) 1997-09-18 1997-09-18 Static mixer
AT98954196T ATE220945T1 (en) 1997-09-18 1998-09-18 STATIC MIXER
KR10-2000-7002858A KR100366679B1 (en) 1997-09-18 1998-09-18 Static mixer
PCT/DE1998/002780 WO1999013972A1 (en) 1997-09-18 1998-09-18 Static mixer
JP2000511577A JP2001516635A (en) 1997-09-18 1998-09-18 Stationary mixer
DK98954196T DK1007191T3 (en) 1997-09-18 1998-09-18 Use of a stretch grille
DE59804914T DE59804914D1 (en) 1997-09-18 1998-09-18 STATIC MIXER
ES98954196T ES2181290T3 (en) 1997-09-18 1998-09-18 STATIC MIXER.
EP98954196A EP1007191B1 (en) 1997-09-18 1998-09-18 Static mixer
US09/519,384 US6401449B1 (en) 1997-09-18 2000-03-03 Expanded grid static mixer
US10/133,258 US6553755B2 (en) 1997-09-18 2002-04-25 Expanded grid static mixer

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EP (1) EP1007191B1 (en)
JP (1) JP2001516635A (en)
KR (1) KR100366679B1 (en)
AT (1) ATE220945T1 (en)
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EP1007191B1 (en) 2002-07-24
WO1999013972A1 (en) 1999-03-25

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